package com.example.chat.base.blur;

/**
 * Copyright (C) 2015 Wasabeef
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.renderscript.RSRuntimeException;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.Transformation;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapResource;


public class BlurTransformation implements Transformation<Bitmap> {

        private static int MAX_RADIUS = 25;
        private static int DEFAULT_DOWN_SAMPLING = 1;

        private Context mContext;
        private BitmapPool mBitmapPool;

        private int mRadius;
        private int mSampling;

        public BlurTransformation(Context context) {
                this(context, Glide.get(context).getBitmapPool(), MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
        }

        public BlurTransformation(Context context, BitmapPool pool) {
                this(context, pool, MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
        }

        public BlurTransformation(Context context, BitmapPool pool, int radius) {
                this(context, pool, radius, DEFAULT_DOWN_SAMPLING);
        }

        public BlurTransformation(Context context, int radius) {
                this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING);
        }

        public BlurTransformation(Context context, int radius, int sampling) {
                this(context, Glide.get(context).getBitmapPool(), radius, sampling);
        }

        public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) {
                mContext = context.getApplicationContext();
                mBitmapPool = pool;
                mRadius = radius;
                mSampling = sampling;
        }

        @Override
        public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
                Bitmap source = resource.get();

                int width = source.getWidth();
                int height = source.getHeight();
                int scaledWidth = width / mSampling;
                int scaledHeight = height / mSampling;

                Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
                if (bitmap == null) {
                        bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
                }

                Canvas canvas = new Canvas(bitmap);
                canvas.scale(1 / (float) mSampling, 1 / (float) mSampling);
                Paint paint = new Paint();
                paint.setFlags(Paint.FILTER_BITMAP_FLAG);
                canvas.drawBitmap(source, 0, 0, paint);

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                        try {
                                bitmap = RSBlur.blur(mContext, bitmap, mRadius);
                        } catch (RSRuntimeException e) {
                                bitmap = FastBlur.blur(bitmap, mRadius, true);
                        }
                } else {
                        bitmap = FastBlur.blur(bitmap, mRadius, true);
                }

                return BitmapResource.obtain(bitmap, mBitmapPool);
        }

        @Override
        public String getId() {
                return "BlurTransformation(radius=" + mRadius + ", sampling=" + mSampling + ")";
        }
}
